Preheat waffle iron according to maker’s instructions.
In a large bowl, whisk together flour, baking powder, cinnamon and salt. In a separate bowl, mix banana, buttermilk, rum, oil, eggs, and vanilla. Slowly whisk the wet ingredients into the dry, stirring only until combined (do not overmix!).
Grease waffle iron with nonstick spray between each round of waffles. Pour batter into mold and cook to desired doneness.
While the waffles are cooking, make the bananas foster! In a large saucepan over medium low heat, melt the brown sugar, rum, maple syrup, and butter. Once melted, turn heat to medium and add in bananas. Use a spatula to flip the bananas so they cook evenly. Cook for roughly 5 minutes total, until the bananas turn a nice golden color and soak up almost all of the sauce.
To plate your waffles, top each waffle with some of the bananas foster, then top with vanilla ice cream, chopped pecans, and maple syrup!